<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>群组选择器</title>
<style type="text/css">
section > article,
section > aside,
section > div {
	color: #f00;
	margin-top: 10px;
	background: #abcdef;
}
</style>
</head>
<body>
<section>
	<article>article</article>
	<aside>aside</aside>
	<div>div</div>
</section>
</body>
</html>